Hydroxy-functionalized imidazolium bromides as catalysts for the cycloaddition of CO2 and epoxides to cyclic carbonates

Michael H. Anthofer; Michael E. Wilhelm; Mirza Cokoja; Markus Drees; Wolfgang A. Herrmann; Fritz E. Kühn

doi:10.1002/cctc.201402754

Hydroxy-functionalized imidazolium bromides as catalysts for the cycloaddition of CO₂ and epoxides to cyclic carbonates

Michael H. Anthofer, Michael E. Wilhelm, Mirza Cokoja, Markus Drees, Wolfgang A. Herrmann, Fritz E. Kühn

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

137 Scopus citations

Abstract

Hydroxy-functionalized mono- and bisimidazolium bromides were synthesized and applied as catalysts for the cycloaddition of CO₂ and epoxides to cyclic carbonates. A catalyst screening showed the influence of the number of protic hydrogen atoms at the cation for the activation of epoxides. The most active catalyst operates at very mild reaction conditions (70 °C, 0.4 MPa CO₂) and can be easily recycled ten times without loss of activity.

Original language	English
Pages (from-to)	94-98
Number of pages	5
Journal	ChemCatChem
Volume	7
Issue number	1
DOIs	https://doi.org/10.1002/cctc.201402754
State	Published - Jan 2015

Keywords

CO fixation
Cyclization
Hydrogen bonds
Organocatalysis
Sustainable chemistry

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abstract = "Hydroxy-functionalized mono- and bisimidazolium bromides were synthesized and applied as catalysts for the cycloaddition of CO2 and epoxides to cyclic carbonates. A catalyst screening showed the influence of the number of protic hydrogen atoms at the cation for the activation of epoxides. The most active catalyst operates at very mild reaction conditions (70 °C, 0.4 MPa CO2) and can be easily recycled ten times without loss of activity.",

keywords = "CO fixation, Cyclization, Hydrogen bonds, Organocatalysis, Sustainable chemistry",

author = "Anthofer, {Michael H.} and Wilhelm, {Michael E.} and Mirza Cokoja and Markus Drees and Herrmann, {Wolfgang A.} and K{\"u}hn, {Fritz E.}",

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AU - Anthofer, Michael H.

AU - Wilhelm, Michael E.

AU - Cokoja, Mirza

AU - Drees, Markus

AU - Herrmann, Wolfgang A.

AU - Kühn, Fritz E.

PY - 2015/1

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AB - Hydroxy-functionalized mono- and bisimidazolium bromides were synthesized and applied as catalysts for the cycloaddition of CO2 and epoxides to cyclic carbonates. A catalyst screening showed the influence of the number of protic hydrogen atoms at the cation for the activation of epoxides. The most active catalyst operates at very mild reaction conditions (70 °C, 0.4 MPa CO2) and can be easily recycled ten times without loss of activity.

KW - CO fixation

KW - Cyclization

KW - Hydrogen bonds

KW - Organocatalysis

KW - Sustainable chemistry

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ER -

Hydroxy-functionalized imidazolium bromides as catalysts for the cycloaddition of CO₂ and epoxides to cyclic carbonates

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Keywords

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